physics
posted by Donna .
A 0.67kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.10 to 0.21 m (relative to its unstrained length), the speed of the sphere decreases from 5.35 to 4.55 m/s. What is the spring constant of the spring? (The sphere hangs from the bottom of the spring.)
N/m

K(Ho)^2+(m)(Vo^2)=K(Hf)^2+m(Vo^2)
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